How can I make in php remember me box? I mean is it all about
how long the session of the cookies will last or I have to do something
else?

It won't be a session cookie, those should be destroyed once the user logs out. The most efficient way would be to use a client side cookie. I am sure if you google this you can find a specific example, or even on these forums. See what you can find an try to implement something, then if you have trouble ask for help.

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